Watching this lovely thread, what I am taking away from the discussion is that maybe there isn't an "Aikido" anymore. It looks like the different lines may have drifted far enough apart that "Aikido" as a proper name doesn't work, and you have to shift to "aikido" as a broad, general class.
That's probably been true for longer than many of the folks here have been alive.
OTOH, this thread isn't really about anything fundamental, or even important, IMO.
Anyway, it happens in all martial arts, even the koryu, except there they usually change the name.